[3627] in linux-net channel archive
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daemon@ATHENA.MIT.EDU (Olaf Titz)
Thu Jul 11 09:05:53 1996
Date: Wed, 10 Jul 96 10:54 +0200
From: olaf@bigred.inka.de (Olaf Titz)
To: submit-linux-dev-net@ratatosk.yggdrasil.com
Newsgroups: linux.dev.net
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From: Olaf Titz <olaf@bigred.inka.de>
Subject: Re: proc delays (really about DNS)
Message-ID: <dubkri.2o@bigred.inka.de>
Date: 10 Jul 1996 10:54:51 +0200
References: <199607081726.MAA00572@vpsd5.vrml.k12.la.us>
<31E25F61.3AB0474E@albany.net>
Organization: private Linux site, southern Germany
Lines: 29
Russell Berry <rberry@albany.net> wrote:
> I notice the same thing, but only when I have a ppp connection going,
> when ppp is down and I'm just connected to the local ethernet network,
> it works great. I supposed it was just because the modem ppp was so
> much slower than ethernet that it just takes a while to build the
> routes, especially if it has to access an outside nameserver to get the
> route addresses. Am I right here??
It's not about routes but nameserver access. Especially with a
non-idle PPP link (i.e. while you shuffle some data around it), DNS
queries often time out and are repeated. Depending on what exactly is
in /etc/resolv.conf, queries may also be made which never get through.
It would be nice to have a setup where those always fail immediately,
but I guess the current resolver library is too inflexible about it.
(I have something like a double-split DNS - two different, strictly
disjoint connections, one of which is always up and the other one not,
and each of them has its _own_ nameserver. A nightmare to get the
resolver working for all cases. I have not found a solution other than
running it all over my own cache-only nameserver, and still it was a
big win to make that a secondary for the non-Internet zone. Oh well, I
guess I need more RAM.)
olaf
--
___ Olaf.Titz@inka.de or @{stud,informatik}.uni-karlsruhe.de ____
__ o <URL:http://www.inka.de/~bigred/> <IRC:praetorius>
__/<_ >> Just as long as the wheels keep on turning round
_)>(_)______________ I will live for the groove 'til the sun goes down << ____
